KVM: s390: pci: Fix memory accounting for pinned/unpinned pages

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Summary

CVECVE-2026-74514
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 13:17:56 UTC
Updated2026-08-17 06:19:48 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: KVM: s390: pci: Fix memory accounting for pinned/unpinned pages The account_mem() and unaccount_mem() functions call get_uid() which increments the reference count of struct user_struct on every invocation. But we don't decrement the count by calling free_uid(). It also accounted/unaccounted the pages against the current->mm. But its possible the unaccount_mem() can be called from a different process context than the one that originally pinned the pages. Let's fix this by storing the pinning process user_struct and mm_struct when accounting for pinned pages, and subsequently free these resources when the pages are unpinned. [[email protected]: Fixed whitespace]

Risk And Classification

EPSS: 0.001660000 probability, percentile 0.062820000 (date 2026-08-16)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc 70871b121f81d08879363cb1238a4c85c5c2800c git Not specified
CNA Linux Linux affected 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc e3f732e086e438c52c7400bd2734bb166aa4752c git Not specified
CNA Linux Linux affected 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc 36f6999ecde3976731a8bfc0b8e667da6f593069 git Not specified
CNA Linux Linux affected 6.0 Not specified
CNA Linux Linux unaffected 6.0 semver Not specified
CNA Linux Linux unaffected 6.18.44 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.8 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e3f732e086e438c52c7400bd2734bb166aa4752c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/36f6999ecde3976731a8bfc0b8e667da6f593069 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/70871b121f81d08879363cb1238a4c85c5c2800c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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